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Sunday, April 29, 2012

Lecture: Modeling Natural Sounds

Modeling Natural Sounds with Modulation Cascade Process (27:51) Richard Turner, University College, London. Auditory scene analysis is extremely challenging. One approach, perhaps that adopted by the brain, is to shape useful representations of sounds on prior knowledge about their statistical structure. For example, sounds with harmonic sections are common and so time-frequency representations are efficient. Most current representations concentrate on the shorter components. Here, we propose representations for structures on longer time-scales, like the phonemes and sentences of speech. We decompose a sound into a product of processes, each with its own characteristic time-scale. This demodulation cascade relates to classical amplitude demodulation, but traditional algorithms fail to realise the representation fully. A new approach, probabilistic amplitude demodulation, is shown to out-perform the established methods, and to easily extend to representation of a full demodulation cascade. Source: Vimeo

World Forum for Acoustic Ecology

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This is a directory of Internet videos related to the field of Acoustic Ecology. At the left are the most recent additions. The full list is archived below. All videos are listed by category on the WFAE web site, which is updated once a month.

Acoustic Ecology

"Acoustic ecology, sometimes called soundscape ecology, is the relationship, mediated through sound, between living beings and their environment. Acoustic ecology studies started in the late 1960s with R. Murray Schafer and his team at Simon Fraser University (Vancouver, Canada) as part of the World Soundscape Project."

"The first study produced by the WSP was titled The Vancouver Soundscape. The interest in this area grew enormously after this pioneer and innovative study and the area of acoustic ecology raised the interest of researchers and artists all over the world. In 1993 the members of the by now large and active international acoustic ecology community formed the World Forum For Acoustic Ecology." (Source: WIKIPEDIA )